From Wikipedia, the free encyclopedia. Masaru Hamaguchi (born 1972, Konohana-ku, Osaka) is a Japanese comedian and actor. People have affectionately given him nicknames i.e. Gucchyon, Hamaguchyon, Hamaguche, Masaru-san, Massaru, etc. Description above from the Wikipedia article Masaru Hamaguchi, licensed under CC-BY-SA, full list of contributors on Wikipedia.